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"In mathematics and computer science, an algorithm ... is a step-by-step procedure for calculations. Algorithms are used for calculation, data processing, and automated reasoning.
An algorithm is an effective method expressed as a finite list of well-defined instructions for calculating a function. Starting from an initial state and initial input (perhaps empty), the instructions describe a computation that, when executed, proceeds through a finite number of well-defined successive states, eventually producing "output" and terminating at a final ending state. The transition from one state to the next is not necessarily deterministic; some algorithms, known as randomized algorithms, incorporate random input." [Algorithm. Wikipedia]
The algorithm flow chart example "Selection sorting method" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Flowcharts solution from the area "What is a Diagram" of ConceptDraw Solution Park.
Flowchart - Selection sorting method
Flowchart - Selection sorting method, terminator, process, preparation, off-page reference, circle, decision,

ConceptDraw Arrows10 Technology

When you are connecting existing objects you can control the diagram structure by changing selection order.

This is how diagramming software should work. You are able to draw a diagram as quickly as the ideas come to you.